package com.itheima.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * 检查用户是否登录
 */
@Slf4j
@WebFilter(filterName = "loginCheckFilter",urlPatterns = "/*")
public class LoginCheckFilter implements Filter {
//    路径匹配器，支持通配符
    public static final AntPathMatcher PATH_MATCHER=new AntPathMatcher();
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest)servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
//        1、获取本次请求的URI
        String requestURI = request.getRequestURI();
        log.info("本次请求的URI为{}",requestURI);
//        不需要处理的请求
        String []urls=new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/sendMsg",//移动端发送短信
                "/user/login"//移动端登录
        };
//        2、判断本次请求是否需要处理
        boolean check = check(urls, requestURI);
//        3、如果不需要处理，则直接放行
        if(check){
            filterChain.doFilter(request,response);
            log.info("本次放行请求的URI为{}",requestURI);
            return;
        }
//        4-1、判断登录状态，如果已登录，则直接放行
        if(request.getSession().getAttribute("employee")!=null){
            Long empId = (Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrrntId(empId);
            filterChain.doFilter(request,response);
            log.info("已登录放行请求的URI为{}",requestURI);
            return;
        }
        //        4-2、判断移动端登录状态，如果已登录，则直接放行
        if(request.getSession().getAttribute("user")!=null){
            Long userId = (Long) request.getSession().getAttribute("user");
            BaseContext.setCurrrntId(userId);
            filterChain.doFilter(request,response);
            log.info("移动端已登录放行请求的URI为{}",requestURI);
            return;
        }
//        5、如果未登录则返回未登录结果,通过输出流方式向客户端页面响应数据
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        log.info("未登录请求的URI为{}",requestURI);
        return;
    }
    public boolean check(String urls[], String requestURI){
        for(String url:urls){
//            match==true:表示匹配
            boolean match = PATH_MATCHER.match(url, requestURI);
            if(match){
                return true;
            }
        }
        return false;
    }
}
